Automatic cut-out switch for motors



' Oct. 26 1926. 1,604,497

B. A. STOCKING AUTOMATIC CUT-OUT SWITQH FOR MOTORS Filed Sept. 2, 1924 1a switch device I fully set forth,

Patented Oct. 26, 1926.

OF AUDUBON, IOWA.

This invention rel BERT A. STOCKING,

AUTOMATIC GUT-OUT Application filed September ates to improvements inautomatic cut-out switches for electric motors.

The object of my an electric motor, switch may be lish a current permitthe motor to invention is to provide to be used in connection with soarranged that the manually operated to estabthrough the motor, and toreach a pre-determined speed, after which the switch is automaticallyretained in a closed position until the motor speed has dropped below asecond predetermined speed, at which time the switch device will beautomatically opened to prevent burning out of the motor.

A further object is to provide a switch device of the type abovedescribed of simple, durable and inexpensive construction which may beeasily and quickly attached to any of the ordinary types of consists inthe construction,

My invention electric motors.

arrangement and combination of the various parts of the device,

whereby the objects contemplated are attained, as hereinafter more ointt e a illustrated in V in which:

Flgure 1 1s a side elevation of a motor showin ing end of the shaft themanner in ed out in my claims, and ccompanying drawings,

which my improved device is applied thereto.

Figure 2 1s a view taken on the line detail, longitudinal, sectional theline 33 of Figure 2.

Figure 3 is a view taken on detail, transverse, sectional 2-2 of Figure1.

I have used the reference numeral 10 to indicate a motor usual armatureis provided with a end should be exten which shaft 11, one end of whichis provided with the pulley 12, the Opposite (led slightly beyond themotor casing and provided with a pin opening 13.

Mounted on the outer end of the project- 11 I have provided a hub 14secured in position by means of a pin 15 extending through hub 14 isdesigned the opening 13. The to carry a disk 16, one

face of which is perpendicular to the shaft 11, while its opposite facefirst said face so as portion 17. The sai is inclined to the to providean enlarged d enlarged portion 17 is SWITCH FOR MOTORS.

2, 1924. Serial No. 736,369. 9

provided with a slot a hinge member 19 o 18 designed to receive f asecond disk 20.

The said disk 20 has one of its faces inclined to'the opposite face insuch a manner that as the said inclined faces of the two disks areplaced adjacent, the outer faces will be parallel.

The member 19 is pivotally secured in the slot 17 by means of a pin 21.The member 19 assumes the form of a lug which extends laterally from theinclined face of the member 20.

The central portion of the member 20 is provided with a screw having alock nut 23 member 22 may be the member 20. The with an opening 24threaded sleeve 22 by means of which the adjustably secured in member 16is provided in alinement with the sleeve 22. The said sleeve and thesaid opening- 24 are designed to receive an extensl said springproviding means coil spring 25,

ble

whereby the free edge of the member 20' may be normally moved member 16,as clearly outwardly from the shown iri Figure 3.

Surrounding the shaft 11 is an annular plate 26 having a flange 27designed to receive a cylindrical shell 28 designed to form a housingfor the members 16 and 20, said shell 28 having an end member 29, thecentral portion of which 30. The said hub 30 signed to receive a havinga shoulder 33 wardly extending flanges 3 1 of This provides means a hubis provided with has an opening slidable switch device 32 designed toengage inthe hub 30.

whereby the outward movement of the member 32 will be limited.

The member 32 is formed of as hard rubber or bakelite.

material such The inner portion of insulating the member 32 is pro videdwith a collar which is formed of an electrical conductor.

The inner end of the member 32 is design-ed to rest against the outerend of the sleeve 22 when the member 20 is in its outward limit ofmovement, with the shoulder 33 againstthe flange 34.

A pair and mounted on insulating blocks of contact members 36 areprovided 17, said contacts being designed to make engagement with theconductor 35 when the member 32' is moved inwardly.

contacts 36 rest on the inwardly extending The free ends of the -but ifthe switch member 7 motor speed has been reduced end 38 of the member 32when the said member is at its outward limit of movement.

The motor 10 is provided with conductor wires 39 and 40. The wire 40 isdivided and has one end connected to oneof the contacts 3 36, while theother end is connected with the opposite contact 36. Thus it will beseen that when the switch member 32 is moved to its outer limit ofmovement, the circuit formed by the conductors 39 and 40 will be openedand the motor 10 willv be stopped,

32 is moved inwardly, then the conductor 35 will engage the contacts '36causing the circuit to be closed and rotation imparted to the motorarmature.

The inward movement of the member 32 will also cause the member 20 to bemoved into engagement with the member 16, in which case the outer facesof the two members are parallel with the pivot member 21 mounted in aplane extending parallel with the outside faces of said disk andsubstan-' tially midway between the said disks when in their closedposition. The member 20 is held in this position against the action ofthe spring 25. a I

It will readily be seen that after the motor has obtained a certainspeed, the member 20 will be automatically retained adjacent to themember 16 by centrifugal action, and will retain such position until theto a certain predetermined'point, or at such point where the spring 25will overcome the centrifugal action of the member 20, at which time themember 20 will be swung outwardly by the action of the spring 25, whichin turn will push the switch device 32 outwardly and break the circuit,causing the motor to be stopped. This provides means whereby the tensionof the spring 25 may be adjusted by the sleeve 22'and the nut 23 so thatany overloading of the motor will cause the speed to be reduced to suchan'extent that the member 20 will be permitted to move outwardly beforethe excessive current caused by the reduction in speed will have hadtime to burn, it out, and thus provide means whereby' the switch devicewill be automatically thrown out of operation at the time the motorspeed has been reducedto a certain predetermined point.

Thus it will be seen that by constructing the switch device 32 so thatit may be manually operated for closing the circuit and automatic meansfor opening the circuit, I have provided means whereby the automaticcircuit opening means may be held out of operation until the desiredmotor speed has been obtained, after which the automatic governor willpermit the circuit to remain closed. I

The shell-28 is detachably connected to he flange 27 by means of pins 41and bayonet slots 42, said shell being removed by first imparting aslight rotary movement to the same, and'then an outward movement,

thus providing means wherebythe operator may have easy access totheinterior of the device for adjusting the spring 25. The member 26 issecured to the side of the motor frame by means of set screws 43.

A disk 44 formed of insulating material is provided between the member20 and'the conductors 40, the member 38 vpassing through an opening 45.secured in position by means of screws 46. This rovides means wherebythe conductor 40 wi 1 be vice 20.

Thus it will be seen that I have rovided an automatic cut-out for motors0 simple, durable and inexpensive construction, which is particularlyadapted to be used on small motors suclt as used to operate washingmachines.

I claim as my invention:

1. A governor device comprising a rota hub provided with a disk, oneface of whic is perpendicular to said hub and having its opposite faceinclined with respect to the first said face, the enlarged portion-ofsaid inclined faces being provided with a slot, a second disk memberhaving one face inclined relative to its opposite face and s0 arrangedthat when the inclined faces are placed adjacent the outer faces of saiddisks will be parallel, means secured to the thinner edge of said seconddisk for entering the groove of the first said disk, a in for pivotingsaid members together, yleldable means for swinging the free edge of thesecond disk away from the first. said disk.

2. A governor device comprising a rotatively mounted shaft, a diskmember mounted centrally thereon, one face of said disk beingperpendicular to said shaft and its opposite face inclined with thefirst said face, a second disk member of'the same diameter as the firstsaid disk member with inclined faces similar to the faces of the firstsaid disk, so arranged that when in one position the inclined faces ofthe two disks may be placed together with the outer faces parallel witheach other, means for pivotal connecting the thinner portion of onedisli adjacent to the heavy portion of the opposite disk, the pivotcenter being mounted in such a manner that as the disks are rotated thepivotally'mounted'disk will move inwardly toward the fixed disk, a

The said disk 44 is mange-e7 diameter as the first said disk member withinclined fares similar to the faces of the first snid disk, so arrangedthat when in one position the inclined faces of the two disks nuiy heplaced together with the outer feces perallel with each other, means forpiv0tally connecting the thinner portion of one disk adjacent to theheavy portion of the Opposite disk, the pivot center bein mounted insuch a manner that as the isks are rotated the pivotally mounted diskwill move inwardly toward the fixed disk, a spring device for yieldablyholding the pivoted disk from the fixed disk, and means for adjustingthe tension of said spring.

BERT A. STOCKING

